So? I kept my old straight 6 because, well, it's an old straight 6. If I wanted something modern why the heck would I bother with a 4200 when I can do so, so much more with an LS? Especially when the LS has gobs of aftermarket support.
You keep pushing the 4200 but nobody is listening...
Main reasons are:
1) its different.
2) a near stock 4200 with a chinese turbo is a 450 hp engine.
LS engine swaps are everywhere, just like every one with a SBC had a holley carb, Edlebrock intake and some brand of headers in years past.
This is the inliners right? dedicated to all inline engines.
The reaction that people get to a 4200 swap is a crowd of folks trying to figure out what it is... try asking some of the others that had done the swap.
I've discussed this topic with a few inliners over the years including Tom L. and the more common theme was the assumption that there is no support for the 4200 is no longer true.